At a press conference early Sunday, authorities said
they arrested Cetin after receiving witnesses' tips and reviewing
security videos from outside the mall that helped them identify
his vehicle.

Cetin was known to authorities, and was arrested last year
on an assault charge, authorities said. Police
added that they haven’t yet determined a motive for the
shooting.

Police first received reports of shots fired in
Burlington's Cascade Mall around 7 p.m. PT on Friday
night. A gunman had opened fire in a
Macy's department store, killing four women and critically
injuring a man, who later died in a hospital.

The shooter then disappeared under the cover of darkness at the
Cascade Mall on Friday, authorities said. The
suspect remained at large for nearly a full day as
authorities launched their search.

The suspect is believed to have entered the mall in Burlington,
around 65 miles (105 km) north of Seattle, and began shooting in
the cosmetics section of the Macy's store, police said.

He initially walked into the shopping center without the rifle,
but surveillance video later caught him brandishing the weapon,
said Lieutenant Chris Cammock of the Mount Vernon Police
Department at a briefing on Saturday.

(Reuters reporting by Alex Dobuzinskis in Los Angeles and
Curtis Skinner in San Francisco; Editing by Michael Perry)